[PATCH 14/23] kbuild: add $(objtree)/ prefix to some in-kernel build artifacts
From: Masahiro Yamada
Date: Tue Sep 17 2024 - 10:20:57 EST
$(objtree) refers to the top of the output directory of kernel builds.
This commit adds the explicit (objtree)/ prefix to build artifacts
needed for building external modules.
This change has no immediate impact, as the top-level Makefile
currently defines:
objtree := .
However, it prepares for supporting the building of external modules
in a different directory.
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
Makefile | 10 +++++-----
scripts/Kbuild.include | 2 +-
scripts/Makefile.build | 4 ++--
scripts/Makefile.modfinal | 14 +++++++-------
scripts/Makefile.modinst | 2 +-
scripts/Makefile.modpost | 12 ++++++------
scripts/depmod.sh | 4 ++--
7 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/Makefile b/Makefile
index ee9ad0f0960f..c923bea7043b 100644
--- a/Makefile
+++ b/Makefile
@@ -354,7 +354,7 @@ else # !mixed-build
include $(srctree)/scripts/Kbuild.include
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
-KERNELRELEASE = $(call read-file, include/config/kernel.release)
+KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release)
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
@@ -717,7 +717,7 @@ endif
export KBUILD_MODULES KBUILD_BUILTIN
ifdef need-config
-include include/config/auto.conf
+include $(objtree)/include/config/auto.conf
endif
ifeq ($(KBUILD_EXTMOD),)
@@ -780,13 +780,13 @@ else # !may-sync-config
# and include/config/auto.conf but do not care if they are up-to-date.
# Use auto.conf to show the error message
-checked-configs := include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf
+checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf)
missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs))
ifdef missing-configs
-PHONY += include/config/auto.conf
+PHONY += $(objtree)/include/config/auto.conf
-include/config/auto.conf:
+$(objtree)/include/config/auto.conf:
@echo >&2 '***'
@echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:'
@printf >&2 '*** - %s\n' $(missing-configs)
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index ed8a7493524b..8c311b997e24 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -205,7 +205,7 @@ if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:)
cmd_and_fixdep = \
$(cmd); \
- scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
+ $(objtree)/scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
rm -f $(depfile)
# Usage: $(call if_changed_rule,foo)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 8403eba15457..6e8954cbf53a 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -34,7 +34,7 @@ subdir-asflags-y :=
subdir-ccflags-y :=
# Read auto.conf if it exists, otherwise ignore
--include include/config/auto.conf
+-include $(objtree)/include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
include $(srctree)/scripts/Makefile.compiler
@@ -107,7 +107,7 @@ cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
$(obj)/%.i: $(obj)/%.c FORCE
$(call if_changed_dep,cpp_i_c)
-genksyms = scripts/genksyms/genksyms \
+genksyms = $(objtree)/scripts/genksyms/genksyms \
$(if $(1), -T $(2)) \
$(if $(KBUILD_PRESERVE), -p) \
-r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null)
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index 1482884ec3ca..6d8aa3059ee2 100644
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal
@@ -6,7 +6,7 @@
PHONY := __modfinal
__modfinal:
-include include/config/auto.conf
+include $(objtree)/include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
# for c_flags
@@ -37,15 +37,15 @@ quiet_cmd_ld_ko_o = LD [M] $@
cmd_ld_ko_o = \
$(LD) -r $(KBUILD_LDFLAGS) \
$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
- -T scripts/module.lds -o $@ $(filter %.o, $^)
+ -T $(objtree)/scripts/module.lds -o $@ $(filter %.o, $^)
quiet_cmd_btf_ko = BTF [M] $@
cmd_btf_ko = \
- if [ ! -f vmlinux ]; then \
+ if [ ! -f $(objtree)/vmlinux ]; then \
printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
else \
- LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base vmlinux $@; \
- $(RESOLVE_BTFIDS) -b vmlinux $@; \
+ LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base $(objtree)/vmlinux $@; \
+ $(RESOLVE_BTFIDS) -b $(objtree)/vmlinux $@; \
fi;
# Same as newer-prereqs, but allows to exclude specified extra dependencies
@@ -57,8 +57,8 @@ if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
# Re-generate module BTFs if either module's .ko or vmlinux changed
-%.ko: %.o %.mod.o $(extmod_prefix).module-common.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE
- +$(call if_changed_except,ld_ko_o,vmlinux)
+%.ko: %.o %.mod.o $(extmod_prefix).module-common.o $(objtree)/scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),$(objtree)/vmlinux) FORCE
+ +$(call if_changed_except,ld_ko_o,$(objtree)/vmlinux)
ifdef CONFIG_DEBUG_INFO_BTF_MODULES
+$(if $(newer-prereqs),$(call cmd,btf_ko))
endif
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index 4d81ed9af294..2d39d452c49e 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -6,7 +6,7 @@
PHONY := __modinst
__modinst:
-include include/config/auto.conf
+include $(objtree)/include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
install-y :=
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 44936ebad161..12e7c15d099c 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -35,10 +35,10 @@
PHONY := __modpost
__modpost:
-include include/config/auto.conf
+include $(objtree)/include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
-MODPOST = scripts/mod/modpost
+MODPOST = $(objtree)/scripts/mod/modpost
modpost-args = \
$(if $(CONFIG_MODULES),-M) \
@@ -119,11 +119,11 @@ include $(kbuild-file)
output-symdump := $(KBUILD_EXTMOD)/Module.symvers
-ifeq ($(wildcard Module.symvers),)
-missing-input := Module.symvers
+ifeq ($(wildcard $(objtree)/Module.symvers),)
+missing-input := $(objtree)/Module.symvers
else
-modpost-args += -i Module.symvers
-modpost-deps += Module.symvers
+modpost-args += -i $(objtree)/Module.symvers
+modpost-deps += $(objtree)/Module.symvers
endif
modpost-args += -e $(addprefix -i , $(KBUILD_EXTRA_SYMBOLS))
diff --git a/scripts/depmod.sh b/scripts/depmod.sh
index e22da27fe13e..3c34fecacbc8 100755
--- a/scripts/depmod.sh
+++ b/scripts/depmod.sh
@@ -12,7 +12,7 @@ KERNELRELEASE=$1
: ${DEPMOD:=depmod}
-if ! test -r System.map ; then
+if ! test -r "${objtree}/System.map" ; then
echo "Warning: modules_install: missing 'System.map' file. Skipping depmod." >&2
exit 0
fi
@@ -25,7 +25,7 @@ if [ -z $(command -v $DEPMOD) ]; then
exit 0
fi
-set -- -ae -F System.map
+set -- -ae -F "${objtree}/System.map"
if test -n "$INSTALL_MOD_PATH"; then
set -- "$@" -b "$INSTALL_MOD_PATH"
fi
--
2.43.0